The HDMI Input App will only work on a list of selected hardwares:
iAdea XMP-6400 (discontinued)
Zidoo X9, Z9X, X9s
MeLE RTD1195
Geniatech ATV 1810
Qbic BXP-301
Samsung SSP2 - SSP6 and Tizen 6.5 (in landscape mode only)
LG webOS 3.0 - 6.0
BrightSign with HDMI IN port: models XT1143, XT1144-T, XT1145, and XT2145
And here is how you use it with the HDMI Input App.